Planar electrochemical sensors based on tape-cast YSZ layers and oxide electrodes

被引：83

作者：

Di Bartolomeo, E ^{[1
]}

Kaabbuathong, N ^{[1
]}

Grilli, ML ^{[1
]}

Traversa, E ^{[1
]}

机构：

[1] Univ Roma Tor Vergata, Dept Chem Sci & Technol, I-00133 Rome, Italy

来源：

SOLID STATE IONICS | 2004年 / 171卷 / 3-4期

关键词：

electrochemical gas sensors; yttria-stabilized zirconia (YSZ); semiconducting oxides; NO(2) and CO gases; automobile applications;

D O I：

10.1016/j.ssi.2004.05.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electrochemical planar sensors based on yttria-stabilized zirconia (YSZ) with semiconducting oxides (WO(3) and LaFeO(3)) and mixed conductors (La(0.8)Sr(0.2)FeO(3)) as sensing electrodes were investigated. The electromotive force (EMF) of the sensors was measured at fixed temperature (450-700 degreesC) and different concentrations of NO(2) and CO in air in the range 20-1000 ppm. The sensors were wholly exposed to the same gas atmosphere, alternatively air and different gases in air, without using reference air. Fast and stable response was measured for all the different sensors. The EMF of p- and n-type semiconducting-based sensors was measured in opposite directions upon the same gas exposure. These results obtained for the response of planar sensors with different semiconductor sensing electrodes showed that the sensing mechanism cannot be explained by mixed potential theory. The response of these sensors is better described by a differential electrode equilibria sensing mechanism. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：173 / 181

页数：9

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